Micro-bubble generator

Abstract

A microbubble generator is described, that enables inexpensive manufacturing cost and miniaturization to generate micro bubbles in certain embodiments, without adopting the complicated prior art venturi tube structure. One embodiment has a water supply side joint on one end of a main tube which is formed as a cylinder and a water drain side joint on the other. The supply side joint and the drain side joint are connected with a water channel that runs along the axis of the tube, and in the middle of said channel there is a narrower, restricted channel whose internal diameter is 6 millimeters or less. A water supply side channel is constituted between the supply side joint and the restricted channel, and a water drain side channel is constituted between the restricted channel and the drain side joint.

I claim: 
     
       1. A microbubble generator comprising:
 a water supply side joint on one end of a main tube which is formed as a cylinder and a water drain side joint on the other end; 
 wherein the supply side joint and the drain side joint are connected with a water channel that runs along the axis of the tube, and in the middle of said channel there is a narrower, restricted channel whose internal diameter is between 3 millimeters and 6 millimeters; 
 wherein a water supply side channel is constituted between the supply side joint and the restricted channel, and a water drain side channel is constituted between the restricted channel and the drain side joint, and both the supply side channel and the drain side channel have a larger diameter than that of the restricted channel and are formed as non-tapered, straight holes along the axis; 
 wherein said restricted channel has a side hole which opens along the radial surface of the main tube to outside of the tube, and the side hole is equipped with an adjustment area which has a female thread on its internal surface, and wherein an air intake adjuster equipped with a male thread that conforms with the female thread of the adjustment area is screwed into the side hole in a way that allows it to be rotated, and the screw clearance created between the female and male threads in said adjustment area can be adjusted by rotating the air intake adjuster; 
 wherein said water drain side channel is formed with a smaller diameter than that of the water supply side channel; and 
 wherein said water supply side channel has a supply side bevel which decreases the internal diameter of the supply side channel as it approaches the restricted channel with the same angle as the included angle of the drilling tool used to make the supply side channel, and said water drain side channel has a drain side bevel which decreases the internal diameter of the drain side channel as it approaches the restricted channel with the same angle as the included angle of the drilling tool used to make the drain side channel.